Composite automatic firearm



w. E. RGSEBUSH.

COMPOSITE AUTOMATIC FIREARM. APPLlcTloN FLED'JIAN. 26, 1920.

, 1,377,629, Patented May`10',1921.

7 SHEETS-SHEET Vl.

vis?? ATTORNEYS W. E. ROSEBUSH.

COMPUSITE AUTOMATIC FIREARM.

APPLxCAIIoN FILED 1AN.26.1920.

1,377,629, Patented May 10, 1921.

1 SHEETS-SHEET 2.

- W. E. ROSEBUSH.-

COMPOSITE AUTOMATIC FIREAHIVI.

APPLICATION HLED 1AN.26,1920.

Patented May 10,1921.

7 SHEETS-SHEET 3.

v 66 HII.

l( 'l W W. E. ROSEBUSH.

COMPOSITE AUTOMATIC FIREARM.

APPLICATION HLED 1'AN.26. 1920.

1,377,629. Patented May 10,1921.

7 SHEETS-SHEET 4.

w/n/Essfs nvm/ron WALDo E. @5550511 @Ms /Uu Br M Anon/vers W. E. ROSEBUSH. COMPOSITE AUTOMATIC FTREARM.

. APPLICATION FII-.ED 1AN|26,920. 1,377,629.

7 SHEETS-SHEET 5.

WITNESS/5S Patented May 1o, 1921;.

W. E. ROSEBUSH. comPosiTE AUTOMATIC FIREAHM. APPucATloN FILED `JAN.26, 1920.

Patented May 1G, 1921.A

1 SHEETS-SHEET 6.

NR s N@ mm1/ron WALDo E. Rasmus/1 UNITED STATES eaten? orrics. i'

WALDO E. ROSEBUSH, OF SPOKNE, WASHINGTON.

COMPOSITE AUTOMATIC FIIVRIEARM.

Specification of Letters Patent. Patented May 10, 192.1.

Application filed January 26, 192.0. Serial No. 353,983. Y

To all whom it may concern.'

Be it known that I, WALDO E. RosEBUsH, a citizen of the United States, and a resident of Spokane, inthe county vof Spokaneand State of 1Washington, have invented a new and Improved Composite Automatic Firearm, of which the following is a full, clear, and exact description.

' The invention relates to recoil-operated,

breech-loading hand firearms, such, for instance, as shown and described in the Letters Patent of the United States,

spectively.

The object of the present invention is to provide a new and improved composite auf tomatic hand firearm which can be readily changed for Ause in target practice or for.

type.

varying recoil incident to the use of cartridges of different caliber, length and power.v

Another object is Vto. provide a composite Y automatic hand firearm which is less expensive and takes up less room and is easier carried about than a series vof firearms capable of ring cartridges of different caliber and length and covering the same range as the improved composite rearm.

Another obj ect is to render the composite firearm exceedingly serviceable for military use by providing a single firearm which can be -used for target practice and readily changed for service. Y

With these and other objects in view, the invention consists of certain novel features of construction, as hereinafter shown and described andthen specically pointed out in the claims. v l

A. practical embodiment of the invention isrepresented in the accompanying draw.

ings forming apart of this specification, in which similar characters of reference indicate corresponding Ypart-s in all the views.

Figure 1 is a side lelevation oftheimproved firearm arranged as a hammerless Vof 32-caliber No.. 1,291,688 and No. 1,311,715, granted to nie Von January 14, 1919, and July29, 1919, re-

Another object is to lcompensate for the,

Fig. 2 is ak similar view ofthe improved firearm arranged. as hammer controlled;

Fig. 3 1s a similar view of the'improved firearm` arranged as a 22-caliber hammer controlled, and provided with a barrel for target practice;

Fig. 4 is a longitudinal section. of the l' improved rearm illustrated in Fig. 1, and with the safety in active position;

Fig. 4ans a'perspective view of the spring for moving thesear into inoperative position on withdrawing theV magazine;

Fig. 5 is a fragmentary view of the iin-l 7 proved firearmfrshown in Fig. 1 `and with the safety off and the parts in firing posi- V tion;

Fig. 6 is a similar view of the lsame with the parts in position after firing, and with the breech block iny position prior toits recoil;

Figs. 7 and 8 are safety lever; Y

Fig..9 is an enlarged of the safety device with the parts in active position, the section being on the line V 9 1-9 of Fig. 11;

Fig. 10 is asimilar view of the same with the parts in inactive position;

Y Fig. 11 is an enlarged cross section ofthe improvedY firearm Von the line 11-11 Fig. 4;

Fig. 12 is an enlarged side elevation of the rear end of the firearm kwith parts in section, on thevline 12-12of Fig. 11;`

Fig. -13 is a perspective view of the grip safety lever; I Y f Fig. 14 is a perspective view of the breech block or bolt used Vin the firearm shown. in

Fig. l;Y

Fig. 15 is a perspective view of' the receiver used in the Vfirearm shown Ain Figs.

1- and 2; Y Y. Y

Fig. 16 is a perspective view of the main frameof the firearm; y

Fig.V 17 is a perspective view of the back strap used in the firearm shown in Fig. 1; Fig. 18 is a perspective viewof'the hammer used in the firearm shown in Fig. 1;

Fig. 19 is a perspective view of the controlling bar controlled by the safety and controlling the scar;

Fig. 2O is a perspective view of the4 trigger; a. a "f Fig. 21 is a perspective view of the'U-'VV piece controlling Vthe Sear;

Fig. 22 is a perspective view of the sear;

fragmentary view 7aVA perspective views of `,he L c block or bolt for the Fig. 23 is a side elevation, partly in secion, 0f the improved firearm illustrated in Fig. 24 is a fragmentary rear side elevation of the same with parts in section;

Fig. 25 is a perspective view of the back str-ap used in the firearms illustrated in Figs. 2 and 3;

Fig. 26.is a perspective view of the breech block or bolt used'in the firearm shown nin Fig. 2;

Fig. 27 is a perspective view of the hammer used in the firearm shown in Figs. 2 and 3;

Fig. 28 is an enlarged sectional side elevation ofthe firearm illustrated in Fig. 3;

Fig. 29 is a perspective view of the barrel used in the firearm shown in Figs. 43 and 28;

Fig. 30 is a perspective view ofthe receiver for the firearm shown in Figs. 3

and 28; Y

Fig. 31 is a perspective view of the breech firearm shown inrFigs'. 3 and 28; 'Y f Y y Fig. 32 .is an enlarged sectional plan of the firearm on the line'32V-'32 of Fig. 28;

Figs.'33, 34 and 35 are perspective views ofthe several parts forming the extractor;

Fig. 36 is a fragmentary view of the sight on the line 36-36 of Fig. 37;

Fig. 37 is an enlarged cross section of the same on the line 37--37 of Fig. 28;

Fig. 38 and 39. are perspective views of parts of the sight.

In the manufacture of automatic firearms the main frame and the actuating mechanism form the most expensive parts. W ith my improvementspresently described in de tail the same main frame and the actuating mechanism mounted thereon are used in conjunction with interchangeable barrels, barrel receivers, breech blocks and magazines thus forming a single, complete, inexpensive composite hand firearm which accommodates all the cartridges of the hand firearm types and dispenses withthe use of I a series of individual firearms, one for each type of cartridge.

arm in its general construction, as illus- The composite hand firetrated in thedrawings, comprises a main frame, an actuating mechanism permanently mounted in the main frame and having two interchangeable hammers, three breech blocks orbolts, two barrel receivers, two barrels, two back stra-ps and two magazines, to allow of forming for service a 32 or 45- caliber hand firearm of the haminerless or the hammer type, or for Vtarget practice to form a 22-caliber hand firearm of the hammer type and long rifle barrel. Use is also made of a special safety device comprising an extra rack bar and a lever, and which safety device is used only in the hammerless type of the hand firearm. Y

The automatic hand rearm illustrated in Y fully explained.

Figs. l and 4f to 22, inclusive, consists essentially of a main frame 50, a barrel 51, a barrel receiver 52, a recoil-operated breech block or bolt 53, a magazine 54, a firing pin 55, a hammer 56, a Sear 57 a trigger 58 and a back strap 59. The main frame 50 is provided with` a suitable handle 6() made hollow and forming a guideway for the removable magazine 54, and the said frame50 is further provided with the usual trigger guard 61 for the trigger 58. The forward end of the main frame 50 is provided with two upwardly extending lugs 62 forming a guideway or a saddle, and on the sides of the said lugs are formed half-round pivots 63 adapted to be engaged by correspond` ingly-shaped notches 64 formedin the sides 65 of the barrel receiver 52 (see Figs. 15 and 16). By the arrangement described the barrel receiver is mounted to' swing on ithe pivot 63 into and out of position on the main frame 50 when assembling or disassembling the firearm, as hereinafter more The sides 65 fit snugly over the sides of the main frame 50 so as to hold the parts mounted on the main frame against accidental displacement. The barrel receiver 52 is provided on top with a saddle provided with spaced segmental grooves 71 engaged vby correspondingly shaped lugs or ribs 72 formed on the under side-of the rear end of the barrel 51 to hold the latter in position onv the barrel receiver 52. The rear end of the saddle 70 and the rear end of'the barrel 51 abut against the forward face of a lug 75 which is an integral part of the main frame 50, and theV back of this lugY 75 is beveled to guide a cartridge 76 into the bore 77 of the barrel 51, as hereinafter more fully explained. The top of the lug 75 is provided with a half-round recess 78 having` an upwardly and forwardly inclined bottom leading to the inclined bottom 79 at the rear end of the Vbore 77 of the barrel 51 to insure proper seating` of the cartridge 76 in the rear end of the barrel. V

rlhe breech block 53 is provided with the usual forwardly extending cover 8O for the barrel 51 and with therecess 82 at the rear end for receiving the. upper portion of the hammer. 56. The sides 83 of the breech block 53 are provided at the inner faces with longitudinally extending grooves 84 mounted to slide on guideways, of which portions 85 and 86 are spaced apartand formed on the barrel receiver 52 (see 15), other portions 87 are formed on a lug 88 forming an integral part of the main` Lef/mesenoticed that by the arrangement described a continuous v guideway is formed which,`

however, is partly on the barrel receiver'52, partly on the main frame 50,' and partly on the back strap 59, and hence the breech block 53 is securely held against' upward movement by the upward pressure of the uppermost cartridge 76 in the magazine 54 at the same time the barrel receiver -52 and the back strap 59lare locked to thelmain frame 50. In order to strengthen the barrelfreceiver 52 the sides 65 thereof are rigidly connected with each of the guideway portionsf86'by an integral crossbar 66 to stifteny theV barrel receiver. The crossb'ar 66 is adapted to abut against theback of thelug 88 thus lholding the barrel receiver 52'V against accidental forward movement.

The breech block 53 is pressed lon-bya spring 90 extending with its forwardv end" into a chamber 91 forming an integral part of the breech blockat the bottom of the forward end, and this chamber 91 fits into@ the guideway formed by thelugs 62.` VThe rear portion `of the lspring is coiled around the pin 92 seated in 'a recess 93 formedY in the saddle 70 of the barrel receiver 52.V ItV of the-barrel 51, -asplainly 'show-n Figs;

4,5a'nd6.v"` The firingrpin 55 is mounted to slide in Y K Y' the breech block 53 Yandv is arranged Vfor center ring thecartridge 76 in the barrel 51 at the time. `The ring pin 55 is of any approved construction and is `preferably of the sectional type illustrated in Figs. 4, 5 and 6, and comprises a front firingpin pressed on by a spring 101, and a rear firing pin 102 engaged by a lock pin'103 to limit;

the sliding movement of the ring -pin 55./

"The hammer 56 is mounted to swing on a pivot 105 held inthe rear portion ot the main4 frame 50, and the said hammer is adapted to Aactuate the -iiring pin 55 in the usual manner. Theheel- 106 ofthehammer 56 is provided with, the lusualfshoulderlll4 adapted to engage a tooth'or lug 112 formed on therear end of the sear 57. to `holdthe hammer 56 Vin cocked position, as'shown inv Figs. 4, 5 and 10. The sear 57 is practically the same as the one shown and Ydescribed in'V Vthe'Letters Patent above referred tov so that further detail descriptionof the same isV not deemed necessary, itbeing under-l Y stood, however, that the forward end of the sear57 is pressed on by a spring 1-13 tolnorf' mally'hold the sea'r 57 in rearmost position to engage the hammer v56Y to hold the same inl *cockedposition(l The rrspring'" 113 is mountedon a pin 114 provided with a. head 115 having-a transverse knifeV edge 116 beariingo'n the front wall of a slot 117-*formed in the main frame 50. VThe knife edge 116 *59. The' g catch 119 engaged'by 'therounded-o tooth 112 .which thusV forms a Vpivot Vfor the searto rock on'up and down, and also to allow the forward and rearward movement of the-said allows va reeup and down rocking movea Sear. The sear 57 is provided near its for- 4 ward end with 'a Vsquare. shoulder 120 adapted to be engaged'by a projection 121 f formed on the trigger 58 ulcrume'dat 122 in the main frame 50 The finger-piece of the trigger 58 extends into the trigger guard 61 to be within convenientposition Ytor the operators finger for pressing the trigger whenever it is desired to move the sear `57 forward against the tension of the spring soY Y 113 to release the hammer 56 for firing pur-V Y poses. A spring 123 is mounted in the main frame 50 and engages the top of the trigger:

58 to hold the latter normally in a rearmost Y position.

1 The rear ends of the sides 65 of the barrel 'Y receiver 5 2 areiockedin Vplace by the back I strap 5951itting into `a, recess in the'pbackV4 of the'handle 60 ofthe main Vframe V50. VThe lower end ofthe backv strap V59 is pivotedv to the handle 60 'and the upper endof terminating in catches .132 engaging shoul-g ders 133 formed on the rear edges of the.VV

sides-65 of thebarrel receiver52, thuslhold-v ing the barrel receiver locked vini position at the back strap-59is providedwith forwardly'v 'extending lugs 131 (seeFigs. 1,12 Aand 17) V{ittingrthe sides of the main frame 5 0 Vland f Y 100,

its rear end: YThe backstrap'59 is provided f V'with a recess" 135 "in `which is'arranged a hammer springyl36 pressing withV its upper end'on the under side ofthe vplunger or head A Y 137Vmounted to slide infthe recess 135. '.The

top of the plunger 137 is pivotally connects." v Y l .1-10 Yupperend aV recess 140 `formed'in the under-V Y ed iat 138 with-la link 139 engaging aty its side of .theY heel-106,101? the hammerj56fto impart a Vforward. swinging movement-to the hammer when the latter vis released by the sear 57. VIt is understood thatgwhen'th'e hammer 56 swingsrcforward it' engages-'the mentioned. rIhe bottomsf'of the lugs 131 ci formed integrally with the sides of the main trame 50, as plainly indicatedin the drawings.

V`firing pin 55 and moves'the same -fo'r'ward Y' to Vre a cartridge 76 held kin the rear `end of the4 bore of the'barrel 51, as previouslyvr Y Ytherbackstrap 59 ynormally resti on lugs 141 Y nions 147 mounted; to turn inthe backstrap A i throughthe handle 60, and itslow'er end is provided with a plate 148 adapted to engage 146 extendsy downward the under side of the bottom 149 Of the magazine 54 removably held in the handle 60. By the arrangement described the hammer spring 136 controls the hammer 56, the catch 146 and the back strap 59 owing to the fact that the catch146 is pivotedon the back strap, as will be readily understood by reference to Fig. 4. Y, Y

In order to effectively lock the firearm, use is made of a safety vdevice capable of v rendering the hammer 56 and the trigger 58 inoperative, at'Y the same time locking the breechblock 53 against movement.` For the:

dotted lines in Figs. 1 and 10) to uppermostV position (shown in full lines in Fig. 1 andin dottedlines in Figs. 9 and'12). It is understood that'when the safety leverr160 is in lowermost or off position then the cams 163 and 164 are in unlocked position (see Fig. 10) toV allow free movement of thevhammer from cocked 4firing position and vice versa. When the hammer is in cocked position and the lever 160 is swung upward then the cams 163 and 164 interlock (see Fig. 9) to hold the hammer 56 against swinging forward into firing position.y

In order to render the trigger 58 inopera-V tive at the time the hammer 56 isv locked in cocked position by the safety device, the following arrangement is made: Onv the VunderV side of the pivot 161 are formed rack teeth 170 in mesh with therteeth 171 of a rack .bar 172V extending forwardly andmountedto slide in' a bearing 173 formed in the lefthand rear portion of the main frame 50.

The forward end of theV rack bar 172 is provided with a bevel 174 adapted to engage the rounded-off top of one side of a U-shaped controlling safety piece 175 mounted to slide upV and down on a bearing 176 formed on the main frame 50 (see Fig. 16), and this controlling safety piece 175 is-seated on the top of the forward portion of the Sear 57. IJV hen the safety lever 160 is in lowermost position the rack bar 172 is in rearward retracted position and hence does not affect the working of the controlling-'safety piece 175 to allow the latter to function the same as described in the Letters Patent above referred to. When the safety lever 160 isV swung into uppermost position the rack bar 172 is moved forwardly by theaction of the meshing rack teeth 170 and 171 and hence the beveled end 174 engages the controlling safety piece 175 and bears the same downward thus moving the Sear 57 downward at its .forward end thereby moving the shoulder 120 out of the path of the projection 121 of the trigger 58 thus rendering the latter inoperative relative to the sea-r (see Fig.- 4). It will be noticed thatshould the hammer safety'fail for anylcause, whatever, the trigger safety, controlled bythe same safety lever 160, rendersthe trigger and hence the firearm inoperative for ring. v In order to hold the breech block 53 locked against sliding movement at the time the safetylever 160 is in uppermost position, the following arrangement is made:` The pivot 161 is 'provided adjacent the lever 160 with a cut-outportion `or notch 180, the bot tom of which is ush Vwith the under side of the left-hand side 83 of the breech block 53, and this side 83 is provided with a cut-out portion 181 inV register with the. pivot 161 and engaged by thelatter at the timethe safety lever 160Vis swun into an uppermost position, as shown in Fig..12.V It will be noticed that by the portion of the pivot 161 engaging the cut-out portion or notch 131,` the breech block 53 is locked against rear-. ward kmovement. A second notch 182 is' formed on the left-hand side 83 of the breech block `50 a distance forwardof the notch l181,v and this notch is adapted to' be engaged by the pivot 161 at the time the breechblock 5,3 isv pushed into rearmost positionby hand and the safety lever 160 isV swung upward to holdvthe breechblock 53 ,locked in rear- 100 most position. A As the hammer 56 is concealed in the re-` cess 82 the user cannot see the position of the hammer, that is, whether the same is in cocked position or in forward or firing po- 105 Vsition. l/Vhen the safetylever 160 is iny low- 'ermost position and cannot be pushed up by the user then the hammer 56 is :in forward or firing position and not in cocked position.V Inorder tof accomplishthis result the following arrangement is made: The rack bar 1 72 is provided at Vits inner side with a lug 190 adapted to register with 'a segmental groovef191 formed on thelefthand side of the hammer 56, and this groove terminates at its "forward end in an angular groove 192 which Vextends horizontally at the timethe hammer V56 is in cocked position to allow the lug 190 to move from the innerv end of the groovev 191 into and along the 120 groove 192' at .the time the rack bar 172 is moved forward on swinging the safety lever 160.*from lowermost into uppermost position, as previously explained (see Figs. 9 and 10). When the Vhammer 56 is in the firing posi- 125 tion, shown'in Fig. v6, then the lug 19O-abutsA against the back of the heel 106 of the hammer 56 and consequently the safety lever 160 Vcannot be swung upward from the lowermost or off position Vinto uppermost or on position and hence the user knows thatthe ythe Vsafety lever 160 is off and the hammer 56 is cocked, as indicated in Fig. 10,

Ythen the lug 190 is at the upper end of the groove 191 and as the latter is a segmental one the hammer 56 can readily swing forward` for firing the gun whenever the trigger l58 is pulled. .'When, however, the hammer Y'56 is in cocked position and the' safety lever 160 is swung upward and the rack bar 172 is Y Y moved forward then the lug 190 moves along into the groove 192 thus forming a lock for the hammer to prevent the same from accidentally swinging out of cocked position into firing position, as will be readily understood by reference to Fig. 9. By the arrangement described, a supplementary. locking device for the hammeris provided and at the same Y time the user of the firearm. knows what position the hammer 56 is in at the time.

A grip safety is provided for holding the sear 57 in inoperative position relativeto the trigger 58 unless thev grip safety is pressedby the palm of the hand having hold of the handle 60. This grip safety is in the form of. a lever 200 having a pivot 201 en.- gaging an open Vbearing 202 formed on the rear end of the main frame 50 (see Fig. 16), and the lever 200 is provided with a rib 203 engaging a slot 204 formed in the back strap 59. A' spring 205 is mounted on the handle 60 and presses the lever 200 to normally hold the latter in rearmost position, as plainly shown in Figs. 1, 2, 3 and 12. The lever 200 is provided with a forwardly extending arm 206 extending .through a notch 207 formed in the tooth or pivot 112 ofthe sear 57 (see Fig. 22), and the arm 206 terminates in a downwardlyV extending hook 208 normally engaging the forward face of the tooth or pivot 11'2 (see Fig. 12) to hold the sear 57 against forward movementvon pressing the trigger 58- When the Vuser takes holdof the handle 60 the lever 200 is pressed for# ward whereby the hook 208 is lifted out of engagement with the tooth 112 to allow. the sear 57 to be moved forward on pressing the trigger 58. The position ofthe grip safety indicates the position of the hammer. en the hammer is down the rounded portion 111 of the hammer stays the sear 57 so far for (not shown) for pressing the cartridges upward against theY under side of the breech ,block 53 to beV successively pushed'into the bore of the barrel 51 during the return movement of the breech block. lnlcafse the. last cartridge has been pushed into the .barrel51 and the magazine 5.4 is removed for refilling then the sear 57 is moved automatically into inoperative position. to 1 prevent accidental firing of thevirearm -while the last cartridge is in position in the barrel. For the`V purpose mentioned Vuse ismade'V of a flat spring 210 held in a recess 211 formed in the left-hand Vside of the main frame 50, `and the free vend of this spring 210 terminatesin a head212 bearing on the sear 57 and provided at one side with a lug 213 (see'Fig. 4a) adapted to be engaged by the'u'pper forward edge of ythe'magazine 54 at thetimey the latter,v is moved into final position in the handle 60 to swing the spring 210 upward with ,a view` to move Vthe head212 out of lengagement with the sear 57. QNow when the magazine 54is' removed from the handle 6 0 then' the spring `210 by its resiliency swings downward and ceiver 52, the magazine54`,lthe sear 57 yand the trigger 58 are the same as above describedrelative to the hammerless hand firearm shown in Figs. 1 and 4 to 22,-inclusive, so that further description of these parts is main frame 50, the barrel 51, :the barrel renot deemed necessary-- In this type of hand firearm the safety devices above described (except the grip safety) are dispensed with. The hammer 250 is mounted to swing on the pivot and is providedv with a fingerpiece 251 to permit the user to move the hammerf250 by hand in cocked position, in which itis held by thesear 57 until'thelat ter is actuated by the ,trigger 58.- When this' takes Vplace the hammer 25,0 isl'released and swings forward by the action of its spring 136 toV strike the ring pin 55. and thereby fire the cartridge `76 held in the'barrel 51 at the time. The breech block 255 for this firearm is practically the same as the .breech shortened and open. 'Therback strap 260 is lsimilarfto the back strap 59 but isslotted at the top forthe passage of the' upper end of the hammer 250 and its fingerpiece'251. g rl`he back strap 260 is practically. the same as the one shown and described inthe LettersPat'- ent of the United States, No. 1,311,715, above l266 formed in the barrel receiver 52, and the upper end of this slide 265 is adapted to engage a notch 267 formed in the right-hand side of the breech block 255. VThis construc-Y tion is used on firearms of both the hammer and hammerless type. block-255 moves into recoil position it imparts a downward sliding movement to the slide 265 which in turnV moves the sear controlling piece' 175 downward thus moving the sear 57 into inactive position, and when the breech block 255 returns to normal position the slide 265 rengages the notch 267. The slide 265 is held against droppingout of position by a retaining pin 268, as plainly shown in Fig. v26. The slide 265 forms an extension member of the sear controlling piece 175 to allow ofV conveniently placing the latter1 in position on the frame 50.

In order to render each of the firearms herein disclosed exceedingly sensitive use is vmade of an adjusting screw 270 (see Fig. 24)

screwing in the right-hand side of the main frame 50 and engaging with its inner end the back of the tooth 112 of the sear 57. By this arrangement the tooth 112 can be readily adjusted relative to Vthe shoulder 111 to render the firearm exceedingly sensitive,

that is, requiring very little pull onthe part of the user on the trigger 58 to actuate the Sear 57 with a view to release the hammer 250 when it is desired to fire the cartridge in the barrel 51. The breech block 255 is provided with a spring-pressed pivoted eX- tractor 275 of usual construction for eX- tracting the empty shell from the barrel and 'discharging it through the discharging opening 276 in the right side 83 of the breech bloclr255V (see F ig.V 24). This construction is also used-onV the breech block 53.

In the automatic hand firearm for target practice, illustrated in, Figs. 28 to 39, the main frame 50, the Sear 57 andthe trigger 58 are the same as above described relative to the other two types or firearms, and the hammer 250 is the same as the one used in the firearm illustrated inl Figs. 23 to 27, so

` that further descriptionof these parts is not deemed necessary. The barrel receiver 300,

' the barrel 301 and the breech block 302 are practically, in'this case, of the construction shown and Ydescribed inthe Letters Patent of the United States, No. 1,311,715, above referred to, and hence further, description of the same is not deemed necessary. The barrel receiver 300 is provided at the rear end with a stiifeningcrossbar 3053simi1ar to the crossbar 66 of the barrel receiver 52 and adapted to engage the back of the lug87 of the main frame 50 to hold'the barrel receiver When the breech against accidentalforward movement.v It is understood that the barrel 301 is removably mounted in the barrel receiver 300 and the latter is removably mounted on the main frame 50 and the recoil actuated breech block 302 is mounted to slide on the barrel receiver. 300. Y

For this type of hand firearm the extractor mechanism is of special construction and is more fully shown vin Figs. 32, 33, 34 and'35. The extractor 310 is provided at its forward end with a hook 311 adapted to engage the rim 312 of the cartridge 313 contained in the barrel 301 at the time, and the rear end of the extractor 310 is provided with an inwardly extending combined lugfand pivot 315engaging airecess 316 Vformed in thek inner wall ofv a Vrecess 317 arranged in the right-hand side pf the breech block 302. Into this recess 317 fits a plate 320 provided with al recess 321 in which is slidably mounted 'a' combined lock and follower pin 322pressed forwardly by a spring 323 arranged in the recess 321. TheA follower pin 322 bears against the rear end of the extractor 310 adjacent the lpivot 315 so as to engage the hook 311 with lthe rim 312 of the cartridge 313. The follower pin 322 is provided with a locking'extension 325 adapted to snap under the forward wall 326 of the recess 317 to lock the plate 320 in position infthefrecess 317, as'plainly indicated in Figj32. yThe plate 320 is preferably made of brass orl other non-corrosive metal not liable to beattacked-by the gases incident to the firing ofthe cartridge 313 in the barrel 301. When it is desired to remove the extractor from the breech .block 302, a tool is inserted in the forward end of the recess 317 to push the pin 322 rearward until its locking extension 325 clears the wall 326 to allow of taking the plate 320 out of the recess 317. After this has been Vdone,the extractor 310 can be lifted out of tridge 313 at the rimA (see Fig'. 28).v The retaining' pin v331 for this firing pin 330 is placed in a bore 332, formed transversely in the breechV block 302, from the recess 317, and hence this retaining pinf331 cannot be removed from the breech block 302funtil the 'Y plate 320 lis rst removed from the breech block, as above described. The bore 332 connects with a smaller bore 333 leading to the left-hand side of the breech block to permit of inserting a small tool for pushing out the retaining pin 331 whenever it ,endiof thevbarrel .and the rear sight 353 is,

f mounted on the breech block 302. The rear lsight `353is an open sighty and associated is' desired tol remove the ,same `by yway of j @now released. to allow. the springf368rto l ipush the pivot 365 and with it the pivot-360 into Vthe.' position shown 'in .'Fig. l37 withV i the recess 317 after the platev 320 has been removed. f f VThe types of firearm shownin Figs. land 2 are provided with the usual front'and rear sights 350 and 351mounted on thev recoil front and rear sights 352 `and`353, of which the front sight352 is mounted on thefront with it is apeep sight 355 in the form vof 4a plate having an opening 3 56-fadapted to f .,registerlwith the usualvnotcli .357 yin Athe fixed sight 353. AThe peep sight 355 is .pro-

vided Ywith a pivot 360 mounted to turn in abearing 361 arranged on the breech block v302 adjacent the base of the rear .open sight 353., A slot 362 leads into thev top of the i bearing 361 and through this slot 362 extends the base of the peep sight 355, as

plainly shown in Fig. V37. The inner end ofthe pivot 360 is provided with a coupling 31. member 363 engaging, a coupling member 361formed in a pivot 365 mounted toturn in the bearing 361 and turning with the pivot 360 .whenever the .peep sight 355 is swung from horizontal inactive position,

f shown in dotted lines in' Fig. 36, into 'verti-v i "cal active position, as illustrated in Figs. 3, 28, 31, 36 and 37. The pivot 365 is Lpro.-

vided with a'reduced portion 366 extending into an opening 367 formed in the'righthand end wall of the bearing 361, as plainly shown in Fig. 37. A. spring l368 is coiled on the reduced portion 366 and serves to press the pivot 365 and consequently the pivot 36() toward the left to hold the peep sight 355 in engagement with the left-hand wall of the slot 362, thus accurately locating the axis of thepeep sight relative to the axis of the barrel andthe outer sight 350 or 352. It will also be noticedthat the arrangement prevents accidental turning of the peep sight 355 when the latter is in horizontal inactive, or in vertical active position. The pivots 360 and 365 have their axes coinciding, and the inner end of theV coupling member 363 is preferably provided with a centrally arranged pin 370 engaging a central opening 371 Aformed in the pivot 365 to hold the pivots 360 and 365 in axial alinement.

In order to place this peep sight in position in thebearing 361, the pivot 365 with its spring 368 is first placed in the bearing 361 through the open end and then the pivot 360 of the peep sight 355, held in tilted position, is passed through the slot 362 inA engagement with the pivot 365 to push the latter to the right against the tension of its spring 368 until the left-hand end of the pivot 360 clears the left-hand end of the slot 362 to allow of passing the pivot 360 in position portions 378 'and 37 9l `formed on Vthe* pivotf' Y365 to hold theV latter against "accidental lowered position it is below the notch 357 Patent `1. As an article of manufacture, a com-Q 1 th'e .peep sight v355 in contact with .theleft 770:

handwall of the slot 362.1 Itis understood l' actuated breech block 53, and the firearm illustrated in Figs. 3 and28 is provided withVV that the peep sight 355 is provided with'a sectional pivot formed' of the pivots360'and L 36.5 to allow of readily installingpeep sights of diiierentradii or form to suit. individual'i` taste orthe` requirements of the users .eye-

sight. Thus a peep sight 355 of one type.

canbe readily exchanged for anotherone without removing the coupling pivot A365 sight firmly f fromV the ybearing 3 61.

In order vto hold .thefpeep in raised or' lowere'dp'osition,useismade f v of a holdingpin l375 mounted to slide ina recess 37 6..inclined 'downwardly and' forwardly'in the top portion of the breech @5 YjV .block 302.` In this recessy376 is 'held' a spring 377 pressing against V.the hol-ding pin 375 to pushthe latter upwardly andrearwardly' against either of the two flattened turning in .its bearing 361. Itis understood that -when .the peep sight 355 is in, vertical position,` the holding pinr375 engages vthe flattened portion 379 and when the peep sight 355 Vis swung downward-into horizon'- tal position then 4,the holding'pin 1375fe'n'ff gagesthe vforward Vportion 37 8'. It is under'- stoodthat when the peepfsi'ght- 355 is of the sight 353 and hence the latter isl used inconjunction with thefront sight352.

Having thus described my. invention, I claim as new and desire to secure by Letters posite automatic handl firearm,comprisingv f a single main frame provided with amagazine-receiving portionV and lhaving permanently associated With-it an actuating mechanism, a plurality ofbarrels, barrel receivers, breech blocks and magazines, the'lsaid main frame, barrels, barrel receivers, Vbreech 4 blocks and magazines being of dierent types and so constructed to permit an interchangeable assembling of the said barrels, barrel receivers, breech blocks andY maga? zines in sets, with the lsaid single main" frame and its actuating mechanism, to forni. f.'

a number Vof diderent hand firearms for diverse uses. Y'

2. As an article of manufacture, a com-V posite automatic hand firearm, comprising a single main frame providedwith a magazine receiving portion and having associated l therewith an actuating mechanism including a hammer, sear and triggermechanism, a plurality of barrels of different types, a plu-v rality of barrel receivers of different types each carrying one o-the said barrels and each adapted to engage the said main frame detachably, breech blocks of different types each adapted to be slidingly associated with the said mainframe and adapted to coact lwiththe vcorresponding barrel receiver, the said actuating mechanism and magazines of different types each adapted to. detachably fit into the said magazine receiving portion :of the main frame.

3. As anarticle 'of manufacture, a composite automatic hand firearm, comprising a Adifferent types each provided with means f .for detachable engagement by` a corresponding barrel, each barrel receiver being adapted to be detachably securedin place on the said main frame, breech blocks of different types each adapted to be /slidingly engaged with the said main frame and adapted to coact with the corresponding barrel receiver and the selected hammer of the Ysaid actuat-r ing mechanism, and magazinesA V'of different types eachadapted toy detachably t into the said magazine receivingfportion of the main frame. v Y Y 4. In an automatic hand firearm, a main frame, a barrel receiver, a back strap and a breech block, the said main frame back strap and barrel receiver having a continuous "guideway and the said lbreech block being mounted to'slide on the said guideway.

5. In an automatic hand firearm, a main frame provided with an integral `lug having a guideway, a barrel receiver having spaced guideways between which fits the `said lug,

the guideway of the lugy being in alinement said lug, the guideways of the'lug being inf alinement with the spaced guideways on' the said barrel'receiver, a back strap held on the frameand having a guideway in alignement with the said'guideways on the frame and barrel receiver, and a breech block mounted to slidev on the said alined guideways of the main frame, barrel receiver and back strap. y

'- 7 In an automatic hand firearm,- a mam Vframe provided with'a lug having guideway portions, 'a barrel` receiver having spaced guideway portions and between which'extends'the said frame lug, aback strap held on the main frame and provided with guideway portions, the said second guideway portions being'inlalinement and forming a guideway, and a; breech block provided with' grooves slidingly` engaging the said guideway.

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